Stackable desk tray



FIG. 1 is a perspective view of a stackable desk tray showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is an end elevational view thereof. 

The ornamental design for a stackable desk tray, substantially as shown. 